Rotational MOEMS Element for Wavelength Tunable Optical Components
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Solution Overview
Problem
Current microoptoelectromechanical systems (MOEMS) and optical microelectromechanical systems (MEMS) face limitations in performance, particularly in wavelength division multiplexing (WDM) systems, where discrete components lead to high costs, increased complexity, and reduced flexibility, necessitating improvements in MOEMS mirrors and waveguides for enhanced performance and integration.
Innovation Solution
The development of a device comprising a combination of three-dimensional (3D) and two-dimensional (2D) optical waveguides with a rotational MOEMS element, actuator, and pivot, allowing for precise coupling and alignment of optical signals through rotation, enabling wavelength tunability and improved dynamic switching capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete components are used in WDM systems, then system flexibility and reconfigurability are improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple discrete optical components (waveguides, mirrors, filters) into an integrated MOEMS device with a unified substrate structure. The MOEMS mirror integrates the reflective surface, actuator, and pivot mechanism into a single controllable element, while wavelength filters are incorporated directly into the optical path, eliminating the need for separate discrete components and reducing overall system complexity.
Solution Approach 2:
The MOEMS device performs multiple functions within a single integrated structure: it provides wavelength filtering, optical switching, and beam steering capabilities simultaneously. The single MOEMS mirror can deflect light to different wavelengths while the integrated filters provide spectral selection, making the device universally applicable for various WDM operations without requiring separate specialized components.
2Adaptability or versatility
If discrete components are used in WDM systems, then system reconfigurability is improved, but manufacturing cost increases
Solution Approach 1:
Multiple optical functions are merged into a single MOEMS device fabricated on one substrate, reducing the number of discrete components that need to be manufactured, assembled, and aligned. This integration approach simplifies the manufacturing process and reduces overall production costs while maintaining reconfigurability through electronic control of the MOEMS mirror.
Solution Approach 2:
The device achieves reconfigurability by changing operational parameters (voltage applied to the actuator) rather than physically reconfiguring the device structure. This allows the same integrated device to be dynamically reconfigured for different wavelengths and routing paths without requiring multiple physical configurations or assemblies, thereby reducing manufacturing complexity and cost.
3Reliability
If MOEMS elements are integrated with optical waveguides, then performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The MOEMS mirror and optical waveguides are merged into a single integrated device fabricated using compatible processes on the same substrate. This co-integration ensures that the alignment between waveguides and the MOEMS mirror is established during fabrication rather than requiring post-assembly alignment, reducing the practical manufacturing precision requirements while maintaining optimal optical coupling.
4Adaptability or versatility
If the MOEMS mirror deflects light to different wavelengths, then wavelength switching capability is improved, but alignment precision requirements increase
Solution Approach 1:
The optical path and filter positions are pre-configured during device fabrication with the MOEMS mirror in a known reference position. This preliminary alignment ensures that when the mirror deflects to different wavelengths, the optical paths are already optimized for minimal misalignment, reducing the precision requirements for dynamic wavelength switching operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the performance of MOEMS and optical components by increasing flexibility, reducing costs, and improving integration, supporting advanced applications in datacom, telecom, sensors, and mid-infrared optical spectroscopy.
Implementation Method 1
a rotational microoptoelectromechanical (MOEMS) element comprising a pivot, an actuator, and the 2D optical waveguide; wherein a predetermined rotation of the MOEMS element under the motion of the actuator results in the coupling configuration
Implementation Method 2
an optical waveguide structure comprising a first predetermined portion formed from a plurality of three-dimensional (3D) optical waveguides for routing an optical signal upon a substrate and a second predetermined portion comprising a two-dimensional (2D) optical waveguide for routing the optical signals
Implementation Method 3
allowing for precise coupling and alignment of optical signals through rotation
Data Source
AI summary
Wavelength division multiplexing (WDM) has enabled telecommunication service providers to provide multiple independent multi-gigabit channels on one optical fiber. To meet demands for improved performance, increased integration, reduced footprint, reduced power consumption, increased flexibility, re-configurability, and lower cost monolithic optical circuit technologies and microelectromechanical systems (MEMS) have become increasingly important. However, further integration via microoptoelectromechanical systems (MOEMS) of monolithically integrated optical waveguides upon a MEMS provide further integration opportunities and functionality options. Such MOEMS may include MOEMS mirrors and optical waveguides capable of deflection under electronic control. In contrast to MEMS devices where the MEMS is simply used to switch between two positions the state of MOEMS becomes important in all transition positions. Improvements to the design and implementation of such MOEMS mirrors, deformable MOEMS waveguides, and optical waveguide technologies supporting MOEMS devices are presented where monolithically integrated optical waveguides are directly supported, moved and/or deformed by a MEMS.